地震作用下板桩码头结构动力响应研究

摘要

为探究地震作用下板桩码头结构动力响应，采用有限元软件ABAQUS建立了板桩码头二维有限元模型，对板桩码头进行了地震动力响应数值分析，研究了板桩墙入土深度对码头结构地震动力响应的影响及地震作用下的板桩墙后动土压力分布规律。研究表明：（1）板桩墙底部达到嵌固状态后，板桩入土深度的增加对于板桩墙的稳定性没有改善，反而小幅度增加了板桩顶位移及拉杆拉力；（2）地震模拟过程中的表层砂土动土压力较规范计算值偏大，其原因是板桩墙上部受到拉杆的约束作用及板桩墙自身变形，使表层砂土的动土压力更接近于动被动土压力，而在规范计算方法中表层砂土按照动主动土压力计算，表层砂土动土压力计算仍有待进一步完善。%To investigate the dynamic response of sheet pile wharf under seismic loads,a two⁃dimensional fi⁃nite element analysis was carried out by using ABAQUS. The dynamic response of sheet pile wall with different sheet pile insert depth and the distribution of soil pressure of sheet pile under seismic loads were studied. It shows that with the increasing insert depth of the sheet pile,the stability of the sheet pile wall is not improved when the bottom of the sheet pile is embedded. Instead,the displacement of the sheet pile wall at the top end and the stress of the pull rod slightly increase. In addition,the soil pressure on the surface sand layer under seismic loads is larger than the value calculated by using the formula in the code. This can be attributed to the fact that the surface sand layer is actually in the passive conditions due to the restriction effects of the rod and the deformation of the sheet pile. However,in the code,the soil pressure on the surface sand layer is calculated by using the active soil pressure formula. All these show that the calculation method presented in the code need to be modified.